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From "Aleksey Shipilev (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-5014) [drlvm][jit][opt] "instanceof" breaks scalar replacement in the new HashMap implementation
Date Tue, 27 Nov 2007 16:47:43 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-5014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12545908

Aleksey Shipilev commented on HARMONY-5014:

Judging on compile-time logs, this patch fixes the problem.

> [drlvm][jit][opt] "instanceof" breaks scalar replacement in the new HashMap implementation
> ------------------------------------------------------------------------------------------
>                 Key: HARMONY-5014
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5014
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>            Reporter: Dmitry Pronichkin
>         Attachments: H5014.patch
> The new HashMap implementation made by Tim Ellison came into collision with the following
problem: scalar replacement for HashMap.get(Integer.valueOf(..)) is not working. The reason
is that the Integer object is not scalarized because of "instanceof" instruction. But escape
analysis knows the real type of the key and it can evaluate "instanceof" making possible for
the key to be scalarized.

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